register: (Ansible)

You can create variables from the output of an Ansible task with the task keyword.

• https://docs.ansible.com/ansible/latest/user_guide/playbooks_variables.html#registering-variables

If a task fails or is skipped, Ansible still registers a variable with a failure or skipped status, unless the task is skipped based on tags. See Tags for information on adding and using tags.

https://www.middlewareinventory.com/blog/ansible-search-string-file-check-if-string-exists/

 - name: Search string with lineinfile
   hosts: yourhost

   tasks:
     - name: "Searching for a String"
       become: yes
       become_user: root
       register: ispresentvar
       shell: "grep -i 'YOUR_TEXT' /path/to/your/file.txt"

     - name: "sample task in case the String present in the file"
       debug: msg="INFO YOUR_TEXT is present in /path/to/your/file.txt"
       when: ispresentvar is changed

Related terms

• Variables
• when:
• msg: The task includes an option with an undefined variable.
• Ansible state, state:

See also

• Ansible modules: gather_facts, set_fact, ansible.builtin.file, lineinfile, stat, group, mount, git:, package:, command:, shell:, raw:, template:, register:, user:, Ansible playbooks examples, tasks:, lineinfile, blockinfile:, shell:, command:, raw:, ansible.builtin.file, service:, aws.ecs_taskdefinition, aws.asg, docker_container, kubernetes.core.k8s, community., include_tasks
• Ansible: modules, plugins, Playbooks (examples) ansible-playbook, ansible-vault, ansible-inventory, ansible-config, Ansible Tower, Ansible Galaxy (Roles) (ansible-galaxy), ansible-cmdb, gather facts, ansible.cfg, Ansible Molecule, Ansible collections, register, template, --ask-pass, --ask-become-pass, remote_user:, /etc/ansible/hosts, ansible-doc, ansible-lint, .ansible/, --forks, --start-at-task, changelog, inventory, Notify:, ansible HOSTNAME -m ping, gathering, /usr/bin/ansible, ansible -m ping, ansible.builtin, hosts: (Ansible), set fact:, when:, blockinfile:, become method:, include:, git:, AWX, ansible --help, Tags, Ansible variables, versions